December 19th, 2006, 10:02 AM
Fire Team Leader
Join Date: Apr 2006
My Bushmaster upper also had residue around the FSB, but this never caused any malfunctions or reliability issues. A LOT of gas would have to escape in order for it to cause issues, I would think. My heat shields had a lot of residue, too, but, like I said, my upper ran fine.
I have a couple of quesitons for you:
1) What is the make of your upper?
2) What's the barrel length?
3) What type of "issues" are you having? Failure to feed rounds? Short-stroking, i.e., carrier not going all the way back in order to pick up a fresh round? Etc.
Last edited by urbanM14; December 19th, 2006 at 11:39 AM.